With both my pregnancies, I totally felt like AF was coming but it never did. It was weird with this one I lost, because I was CONVINCED I was starting AF anytime, had all my usual cramps and such, so I kept going to the bathroom to check and nothing. Finally after something around 3 or 4 days of this I decided "Oh hell, I'm just gonna test and see". I was expecting a negative (as my cycles had been a little varied the past few I just thought it my was body being crazy) or a -faint- positive if there was one. Not a line almost as dark as the control, which is what I got.
This time, since I know after a miscarriage the cycle is "longer" due to the extra time needed for hormones to settle and regulate, I'm guessing around the 18th or so of July will likely be AROUND when I'm due to expect my AF, but..we'll see I guess.